Mechanized(Ben 10 x male robot autistic reader)

During a road trip with your bff Ben and his bitchy cousin Gwen you get abducted by aliens and they destroy your body and replace it by a robotic copy of it full of weapons and gadgets. They re sended you on earth keeping your body and now you are a alien robot killing machine. Ben for his part found a super watch that make him able to transform into different aliens and Gwen seem to have soften after earing what happened to you.